*{
    margin: 0;
    padding: 0;
}
li{
    list-style: none;
}

.shell{
    width: 1000px;
    height: 400px;
    position: relative;
    overflow: hidden;
    float: left;
    display: block;
}
.images{
    width: 500%;
    /* 几张图片写几百 */
    height: 100%;
    display: flex;
    position: absolute;
    left: 0;
    transition: 0.3s;
}
.img{
    width: 100%;
    background-size: cover;
}
.img:nth-child(1){
    background-image: url("images/1.png");
}
.img:nth-child(2){
    background-image: url("images/2.jpg");
}
.img:nth-child(3){
    background-image: url("images/3.jpg");
}
.img:nth-child(4){
    background-image: url("images/4.jpg");
}
.img:nth-child(5){
    background-image: url("images/5.jpg");
}
.min-box{
    display: flex;
    justify-content: space-evenly;
    position: absolute;
    bottom: 20px;
    width: 100%;
    z-index: 100;
}
.min{
    width: 20px;
    height: 10px;
    background: #fff;
    cursor: pointer;
    border-radius: 10px;
    background-size: cover;
    background-position: -20px 0;
    opacity: .5;
}
.button{
    width: 100%;
    height: 100%;
    position: absolute;
    display: flex;
    justify-content: space-between;
    user-select: none;
}
.button-left,.button-right{
    font-size: 50px;
    padding: 0 50px;
    cursor: pointer;
    line-height: 405px;
}